My favorite memory of Mr. Doohan is from the movie Trekkies. He has an interview wherein he recounts how a fan mailed him saying she was going to kill herself. He was really disturbed by this and got her to come to a convention he was doing that weekend, where he talked to her a little. I believe she came to a bunch of conventions he was at soon after that. If I recall, a few years later she mailed him again saying he had saved her life.

Mr. Doohan was really tearing up as he was recounting this, and I was struck by his deep humanity. We'll miss him. Rest in peace, sir.

Probably the very best thing about film is that we get to keep a little piece of these people in our lives. It's odd really, when you think about it, how much they do affect us. How a statement like "Beam me up, Scotty!" can become such a recognizable part of our culture.
I wonder sometimes if people really appreciate the affect such things and people can have? Fortunately for us, at least Star Trek was a positive effect. So hard to say that about todays current media fare.